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		<title>three.js refraction</title>
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		<div id="container"></div>
		<div id="info">
			<a href="https://threejs.org" target="_blank" rel="noopener noreferrer">three.js</a> - refraction
		</div>

		<script type="module">

			import * as THREE from '../build/three.module.js';

			import { OrbitControls } from './jsm/controls/OrbitControls.js';
			import { Refractor } from './jsm/objects/Refractor.js';
			import { WaterRefractionShader } from './jsm/shaders/WaterRefractionShader.js';

			let camera, scene, renderer, clock;

			let refractor, smallSphere;

			init();

			function init() {

				const container = document.getElementById( 'container' );

				clock = new THREE.Clock();

				// renderer
				renderer = new THREE.WebGLRenderer( { antialias: true } );
				renderer.setPixelRatio( window.devicePixelRatio );
				renderer.setSize( window.innerWidth, window.innerHeight );
				container.appendChild( renderer.domElement );

				// scene
				scene = new THREE.Scene();

				// camera
				camera = new THREE.PerspectiveCamera( 45, window.innerWidth / window.innerHeight, 1, 500 );
				camera.position.set( 0, 75, 160 );

				const controls = new OrbitControls( camera, renderer.domElement );
				controls.target.set( 0, 40, 0 );
				controls.maxDistance = 400;
				controls.minDistance = 10;
				controls.update();

				// refractor

				const refractorGeometry = new THREE.PlaneGeometry( 90, 90 );

				refractor = new Refractor( refractorGeometry, {
					color: 0x999999,
					textureWidth: 1024,
					textureHeight: 1024,
					shader: WaterRefractionShader
				} );

				refractor.position.set( 0, 50, 0 );

				scene.add( refractor );

				// load dudv map for distortion effect

				const dudvMap = new THREE.TextureLoader().load( 'textures/waterdudv.jpg', function () {

					animate();

				} );

				dudvMap.wrapS = dudvMap.wrapT = THREE.RepeatWrapping;
				refractor.material.uniforms.tDudv.value = dudvMap;

				//

				const geometry = new THREE.IcosahedronGeometry( 5, 0 );
				const material = new THREE.MeshPhongMaterial( { color: 0xffffff, emissive: 0x333333, flatShading: true } );
				smallSphere = new THREE.Mesh( geometry, material );
				scene.add( smallSphere );

				// walls
				const planeGeo = new THREE.PlaneGeometry( 100.1, 100.1 );

				const planeTop = new THREE.Mesh( planeGeo, new THREE.MeshPhongMaterial( { color: 0xffffff } ) );
				planeTop.position.y = 100;
				planeTop.rotateX( Math.PI / 2 );
				scene.add( planeTop );

				const planeBottom = new THREE.Mesh( planeGeo, new THREE.MeshPhongMaterial( { color: 0xffffff } ) );
				planeBottom.rotateX( - Math.PI / 2 );
				scene.add( planeBottom );

				const planeBack = new THREE.Mesh( planeGeo, new THREE.MeshPhongMaterial( { color: 0x7f7fff } ) );
				planeBack.position.z = - 50;
				planeBack.position.y = 50;
				scene.add( planeBack );

				const planeRight = new THREE.Mesh( planeGeo, new THREE.MeshPhongMaterial( { color: 0x00ff00 } ) );
				planeRight.position.x = 50;
				planeRight.position.y = 50;
				planeRight.rotateY( - Math.PI / 2 );
				scene.add( planeRight );

				const planeLeft = new THREE.Mesh( planeGeo, new THREE.MeshPhongMaterial( { color: 0xff0000 } ) );
				planeLeft.position.x = - 50;
				planeLeft.position.y = 50;
				planeLeft.rotateY( Math.PI / 2 );
				scene.add( planeLeft );

				// lights
				const mainLight = new THREE.PointLight( 0xcccccc, 1.5, 250 );
				mainLight.position.y = 60;
				scene.add( mainLight );

				const greenLight = new THREE.PointLight( 0x00ff00, 0.25, 1000 );
				greenLight.position.set( 550, 50, 0 );
				scene.add( greenLight );

				const redLight = new THREE.PointLight( 0xff0000, 0.25, 1000 );
				redLight.position.set( - 550, 50, 0 );
				scene.add( redLight );

				const blueLight = new THREE.PointLight( 0x7f7fff, 0.25, 1000 );
				blueLight.position.set( 0, 50, 550 );
				scene.add( blueLight );

				window.addEventListener( 'resize', onWindowResize );

			}

			function onWindowResize() {

				camera.aspect = window.innerWidth / window.innerHeight;
				camera.updateProjectionMatrix();

				renderer.setSize( window.innerWidth, window.innerHeight );

			}

			function animate() {

				requestAnimationFrame( animate );

				const time = clock.getElapsedTime();

				refractor.material.uniforms.time.value = time;

				smallSphere.position.set(
					Math.cos( time ) * 30,
					Math.abs( Math.cos( time * 2 ) ) * 20 + 5,
					Math.sin( time ) * 30
				);
				smallSphere.rotation.y = ( Math.PI / 2 ) - time;
				smallSphere.rotation.z = time * 8;

				renderer.render( scene, camera );

			}

	</script>

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